Method of and apparatus for building up cord blankets for pneumatic tires.



'E. NALL.

METHOD OF AND APPARTUS FOR BUILDING UP CORD BLANI IETS FOR PNEUMATIC TIRES I APPLICATION FILED JULY I0. IQIG. I

1,817,664; Patented Sept. 30, 1919.

to each L we vulcanization. it 320cm cords mmuullmm EON, D1510, ASSIGNOB, TO THE GOODYEAR TIRE AND RUBBER EDVJAI I MALE 11'' numbn- 7 30M? ;..:err, 01? $163611, GHIO, A CORPORATION OF OHIO.

IAETLGD GTE AND .QCPl-ARATUS FEB, BUILEJING U]? 0031) BLANKETS FOR PNEUMATIC THE/LE.

631% N jiqUiL Mi k-"x.

Specification of Letters Patent.

meme se e so, ieie.

Application filed July 1916. Serial No, 108,08.

in Methods oi? and Appuratusyior Buildingup Cord unkets for Pneum ntio'lires, of which the golloiving e specifics ion.

My present iui'ention relates methods for building up cord carcasses for pneumatic tires and, in particular, relates to a novel method for l'r ing up cord blankets to form the plies of the ceriuss.

One of the Well known nicihods of build inn cord ti es in accordance i h the pres en; duy pr: lice is to build corL blanke by laying LO:- side by side and in parallelism s1 bscquently forming the i o? u tire upon :1 ring i suitable gum c i: n ntuviu the cords and in "oi'm, upon it union between udthe same ply. The method usually iolloned to wind continuous cord backward and forward between two spaced parallel sets of pins or other retaining members. so that the cord looped about successive pins provide parallel lengths forming 21 blank 1 the blanketis applied to the co; upon which the carcass is to be built up, iced w are usuall run blankets us core into the strips being provi in the position lei-d 31E;

the beads for the toes hclinishcdiirc. in many (MEGS lug ions a unpts have been made to fee in u up or". the cord into its blanket by pro id u iirzune ex'iuipped With removable so that the blanket may be rem y taken if: cm the frame whei'i it is desired, to puss "rhe heed wires l1 cord loops and to apply the blanket upon the Two infill" of i in the 1 .210 nu endi through the hi i W 'uc blanket and that the apparatus necessitated for laying up the blanket with speed and uniformity is relatively complicated and costly.

. Being cognizant of the conditions above stated, I contemplate herein the provision of a method of laying up cord blankets which does not necessitate the use of a bead Wire nor require a splicing of the beadto be used, While at the same time employing to this end an apparatus reduced to its simplest and cheapest terms.

A principal object of the invention-is to produce a cord blanket by laying the cord in a sheetv of raw gum in such a manner that the cord portions are doubled upon themselves and contact in parallelism without the necessity of any retaining means engaging the loop portions of the cord passes.

A further object of the invention is to pro ride means whereby the blanket may be gagged to an. accurate Width and whereby the desired bias angle of both the cords and the ends of the blanket may be as readily attained, without the necessity of separate measurements for each blanket laid up.

Another object of primary importance is to provide a method wherein coi'd blankets forming the plies of the tire carcass may be securely anchored upon non-extensible beads which are not applied to the blanket plies until the carcass is bein laid uupon its cord blanket as initiated in accordance with v handy for the workmen.

the method of the present invention;

Fig. 2 is a fragmentary plan View of the same subject matter; and

Figs. 3 and d are transverse sectional views taken through the laid-up core showing the application of successive plies to the coreand the anchorage of the plies upon the beads.

The apparatus employedsin the present invention, aside from the handtools of the v circumference of the cord blanket when the latter is linearly stretched out. Supports of a suitable nature, which need no specific illustration, erect the table 5 into a position The top of the table is'covered with a sheet of zinc 6 or some equivalent affording a smooth surface and-[one from which the raw um of each blanket may be readily detache Side rails 7 are secured upon -thetop of the table 5 in a parallel spaced relation that I delineates between the rails the exact width;

ot the cord blanket to be laid up, and a oss-bar 8 connects the side rails at one end or the table in the oblique manner illustrated in Figs. 1 and This cross-bar 8 serves as a guide to determine the bias angle along which the cord passes of the blanket are to be alined in parallelism. This concludes the apparatus necessitated in the practice of t e resent invention, with the exception of the 'c ual hand tools, the mentioned ring core, and a suitable reel or similar support for a quantityof the cord 9 to be used in fabricating the blanket. Preferably this reel, which is not illustrated, is placed in alinement with the space between side rails 'Lof the table, in order that the workman respective rails 7 and its forward end edge in contact with the biased bar. 8. The workman then trims the sheet of gum to the required dimensions, which is preferably done by using the rails 7 and the bar 8 as straightedge guides for a trimming knife held by the operator, he next tamps the free end 11 of the cord 9 upon the gum sheet at the vertex of the acute angle made by the bar 8 I with the adjacent rail 2. Since the cord employed is preferably made up of a number of smaller cords which are twisted together and coated with a rubberized solution, the adhesion betweenthe cord and the gum sheet 10 is so great as to prevent causal displacenent of the cord when it has once been, tamped into place.

The cord. extremity 11 being thus placed in Contact with the bias bar 8, a length of the cord is then finally placed in contact throughout the entire length of the bar until it intersects the opposite rail 7, at which time the worlmian makes a loop in the cord as at A andlays a second length in contact with that ust placed against the bar 8. This process is continued by making alternate loops at every meeting of a cord length with one of the rails 7, until the entire sheet'of gum 10 is covered by parallel cords which are firmly embedded in their position and all of which make similar angles to the sides of the blanket in accordance with the guide 8.

The tool employed by the workmen when laying the cord lengths upon the gum sheet 10 in fabrication of the blanket may conveniently consist of a bar having a spatulate extremity although this has not been illustratcd. With such an implement held in contact with the cord length by one hand, while the other hand presses the cord upon the gum in properalinement with its fellows, great rapidity be secured without injury to the produced blanket.

il hen the laying up process of'the blanket has been concluded, it may very readily be removed from the table without the necessity of detaching any fastening means or of inserting bead wires through the cord loops in order to prevent the individual cords of the blanket from becoming mutually displaced, as the gum sheet 10 is ample Prevention of this fault. The blanket thus produced is now placed with its longitudinal center line in coincidence with that of the ring core 12 so that the lateral edges of the blanket engage the sides of the core and depend equally therebelow.

Prior to the lacing of the cord blanket upon the core it may be found desirable to cut off the loops formed by the bends as the bending of a l i r m loops have met been cut are men bent spective side Walls. lit feces of the beads may be rovided with strips of green or semi-green gum to anchor the rough edges of the cord blanket there to, such edges being bent outwardly to in.- close the beads with their cords at angles re duced from the bias angle of the cords forniing the tread and side Walls propenof the tire.

desired, the la; ied

The second ply of co -ds is laid up upon the table 5 in the manner already described, although being of a slightly increased length, and is similarly built into the carcass upon the core 12, Wit 1 the cords erably at right angles to those of the pro ceding ply. When placed upon the core 12 the second blanket 15 is also stitchel down While the lateral edges of the blanket are bent under the beads i l in a direction opposite to that of the bent edges of the first cord blanket, although similarly thereto the cords in the bent edges lying at an angle to their bias position in the tread suitable method such guni strip about t beads ant the looping blanket edge the may be resorted to to fortify the toes tire againstdisruption into their component and side Walls. Any

parts.

From the preceding description, will be apparent that a method and scans for l ing up cord carcasses or pnenniatir have been disclosed herein in attain of the foregoing objects of my inrentitnn I desire it recognized, however, that such additional refinements may take place in the practice of the invention in latebodiincnts thereof as shall come within the scope of the claims appended hereto.

One suh refinement ot the disclosed method may be instanced 1n the dispensation with the gum strip described as forming the basis of the cord blanket proper. The cords themselves are rubberized and ciently tacky to adhere to each other when laid up upon the table. I have discovered that a cord blanket made in accordance the method discussed in the foregoing but with the omission of the gum sheet 11min.- tains its built'up form to such 2iv degree that the omission of the gum sheet forms no he; to the fabrication of a carcass from the cord )lles or strip. Additional refinements as l adaptations of a like nature of the PHA- ciples disclosed. herein are similarly conirehended by the invention.

What ll claim is:

1. That method of laying up a blanket for a tire casing comprised in j following steps: (a) the trimming of all sheet of; to the desired size and shape of the blanket; and ((2) the laying up of acontinnons cord upon the blanket in such a manner thnt successive lengths of the cord are doubled back upon themselves at opposite edges of. the gum sheet, all of the (loublcd len ehs 0"? said continuous cord being cl'nbedded in the surface ct said gum sheet.

J. 'lbat method of constructing a cord in the fabrication of a tire led. in the following steps: immine; of :1. sheet of uncured gum Iact shape of the finished s of the gum sheet being at e lateral edges thereof; and I w a continuous cord in "when; from one lateral edge of st to another, successive lengths id upon the preceding lengths, l cord lengths being embedded in p is to the bias angle furnished by the ends oi the ,Q'UlYl shmt.

'llhat method of constructing a cord b anhet for use in the fabrication of tire casing comprised in the following steps:

(at) the trinin'iing' of a gum sheet to predetermined diu'iensions; (b) the laying up of. a co tinuous cord in successive lengths exfrom one edge of the gum t e other, each successive length of being doubled upon the preceding iacent edge of the gum sheet; trimming of the sides of the ct, thus produced, to remove the 155. shod of manufacturing cord comprised in the following cutting or a gum sheet to the iective plies of the carcass;

(F) t a continuous cord trai e gum sheet from edge to each length of the continudoubled back upon the precc-l ind in parallelism thereto; {a} tin 3 in '13; one or more finished blanket ylics peripherally on a core; (cl) the *ipnlication an endless bead to the bl plies on the core; and (e) the foldin edge portion" of the blanket plies ease of the bead,

- carntus for laying up annuiir cord tires, at table; side i. distance equal to the Width blanket; and a bias guide ending at an angle between opposite ails whereby the bias angle of the composing the blanket may be doneed.

The method of laying up a cord blanket a tire which consists in laying a c ntinuous cord, previously coated with an i iilQSlVl), in successive lengths, doubled upon each other, and in parallelism, by

- against the prece memes pressing each length as it is laid firml ng one so that it will adhere thereto throughout its entire length, thus forming alined closed loops at both edges, the lines formed by the loops at both edges being parallel to each other ancl oblique to the lengths of the cord.

7. That method of constructing a cord blanket for a a sheet of uncured gum,-

tire casing, which consists in laying up lengths of a,continuous cord upon and simultaneously name in the presence of tWosubscribing Witnesses.

EDWARD NALL. Witnesses:

LELA WAGNER, C. V. P. Nnwnonn. 

